Control and copying device for machine-tools.



, PATENTED' FEB. 26, 190v. H. LIBBERT. CONTROL AND COPYING DEVICE FOR MAGHINE TOOLS.

APPLICATION FILED JULY 18, 1904.

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PATENTE'D FEB. 26 1907] LIEBERVT. CONTROL AND COPYING DEVICE FOR MACHINE TOOLS.

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APPLIOATIOH FILED JULY 18, 1904.

No. 845,305. PATENTED FEB. 26, 1907.

- H. LIEBERT; CONTROL AND COPYING DEVICE FOR MACHINE TOOLS.

APPLIOATION FILED JULY 18, 1904.

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HENRY LIEBERT, OF MILNROWV, ENGLAND.

CONTROL AND COPYENG Specification of Letters f Patent.

DEVlGE FUR llfiAGt-ilNE TOOLS.

Patented Feb. 26, 1907.

Application filed July 13,1904- Serial No. 217.121.

"0 0/57, whom it may concern:

Be it known that I, HENRY liinnnn'r, a subject of the King of Great Britain and ire-- land, and a resident of Perseverance Works, Milli-row, Lancashire, England, have invent-- ed a certain new and useful Control and Copying Device for Machine-Tools, (for which have filed application for British Patent No. 7,085, of March. 2 1, A. D. 1984;) and I do hereby declare thefollow ing to be a f. ill, clear, and exact description of the ii'ivention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention is an improvement on the machine forming the subject-matter of Brit-- ish Patent No. 13,384 of 1899, in which a screw-like form r otherwise known as a control-scroll, was turned in contact with a finger governing the movement of a cutting or abrading tool or the article to be operated on for reproducing in the latter any desired outline.

The chief object of the said invention is to provide for the positive movement of the tool (or alternatively of the article operated on) v in both directions instead of depending on a counterbalance-w eight or its equivalent for the return movement thereof and to adapt the same to certain special uses. To these ends I employ two or more control-scrolls instead of one; and the present invention consists, chiefly, in the combination of them with divers cooperating parts, as hereinafter more particularly set forth and claimed.

In'the accompanying drawings, Figure 1 represents a plan view of a machine embody ing my invention adapted to turn the heads of the axles of rollingstock. Fig. 2 represents a front elevation of the same. Fig. 3 represents an end elevation of the same look ing to the left, the p arts on the machine-bed to the right of line a 0; being removed.

A designates the main frame of the machine, B the main shaft supported thereby, and C a belt coupling the same to the shaft 9 of one of the control-scrolls g for driving 1 the latter shaft from said main shaft. Pin ions g and 9, fast, respectively, on this scroll and the other control-scroll g, couple these two parallel scrolls together and cause them to turn in opposite directions close to each other at the same rate of speed. These control-scrolls are equal in diameter at all corre sponding points and provided at the ends with spirals reversely arranged with respect l to each other. Rollers g and g are in contact v ith the tool-guiding spirals 1 and 2 of scrolls 91 and 9, respectively, on opposite i S1(l6S of the pair of scrolls aforesai 1. These 1 rollers are mornted on a floating cross-slide l g, carrying tool g, and give to said cross-slide l and tool a reciprocating transverse move- \ment determined by the said spirals and l l l l l shifting farther to the rig it or to the left as the said rollers travel len hw ise of the scroll with the floating cross-slide g and the longitudinally-moving main slide, on which the said cross-slide is mounted. This shifting of the position of the tool of course varies the cutting action correspondingly and gives the predetermined contour to the end of the caraxle c, which is held by a chuck e on the re- 4 tating lathe-mandrel E. At the other end of I the pair of control-scrolls, g g two more tooll guiding spirals 1 2 are formed, their relative arrangement being as before stated, but

the taper of each spiral being the reverse of l that on the other end of the same scroll. The spirals 1 2 may be used for governing the cutting ofvtheother end of the axle e. lhey diff er slightly in form,

in action, from spirals 1 and 2; but of course the possible modifications of such forms are very numerous, permitting any desired outline to be given by substituting one pattern of scroll for another. The said scrolls are mounted in a supplemental slide-frame D, l engaged by a screw-shaft h, known as the l back screwshaft, which has a gear-wheel 72/ fast on it, the latter meshing with a similar wheel 9 fast on shaft 9 and driven by the latter to cause the endwise travel of said slide- The advantage of giving longitudinal movement to the scrolls, as well as to the tool and its rollers, is as follows: Unless the path be made broad enough the scroll crushes. The more pathwe get the more accurate is'our work; but we cannot get a broader path by increasing the diameter, because in most cases it is advisable to have two scrolls-one for drawing the work in, the other for pushing the work outand they would take up too much room if made of large diameter; besides other objections. The only other way to practically increase the width of the path is l to make the scrolls travel at a much quicker l rate than the tool-carriage. It has none of l the disadvantages of increasing scroll diamel l frame and of said scrolls.

ter and insures accuracy of work.

A pinion 1), fast on main shaft B,

and consequently meshes IIO with and drives a gear-wheel 0, turning on a the main slide, a tool stud 0, with apinion 1),, which engages a gearwheel fast on the main screw-shaft f, which is thereby turned in the direction opposite to that of the back screw-shaft h, but as screwthreads of these two shafts are inclined reversely (see Fig. 1) withrespect to each other the sliding scroll-fraine D and the main slideframe f travel in the same direction.

The mandrel E is provided with a large fast driving gear-wheel 6 which meshes with and receives motion from a pinion on screwshaft f or other rotative shaft of the machine, as may be'found most convenient, thereby rotating the said mandrel and chuck.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In mechanism for automatically shaping l material to. a predetermined form, the combination of a longitudinally-movable main slide, which carries the article to be acted on, with a floating slide transversely movable on carried by said floating slide for cutting or abrading the said article, a pair of rollers mounted on said floating slide and a pair of parallel control-scrolls, respectively in contact with said rollers and thereby moving the said floating slide and tool positively forward and backward transversely of the main slide according to the relative construction and arrangement of the said scrolls, to correspondingly vary the action of the tool and the form of the article, a back slide having the said scrolls mounted thereon and means for automatically and longitudinally reciprocating the said back frame and the scrolls thereon substantially as set forth.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

HENRY LIEBERT] Witnesses JOHN HALL, G. W. TUNSTALL. 

